Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7853b7dc50423ab1849f1f02f2c9b5cb003f39afaac4795307375f35ea6c0f8' 
  AND token = '95YP1B9+InR72m2ZIxQ2LdiR8sPMgT4UJuEdPv26Ek4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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