Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed710666ae834c3d184cedd8ca5d848ee52f5457b92a1da68594f09457d72c8' 
  AND token = 'UtqfcHkLLLIQTzL3EM5aDQCZd1lgfoDZpJL3E9E/Rl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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