Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8771993ec2cad01ef1efefff9ab2c0306619bff6cc288984520aa79377ff29d' 
  AND token = 'ffZm+Bw/cMra0snb1q/3XZ+7PYKHAyILF2d/MxnjnGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}