Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5818e9652fdf6c0bb91f39daf9e0af85c3ac91653d0ad8176bc27bb05c3db38' 
  AND token = 'NcX4OSMmANAtwMFaD6M7mFHMKlIRPdtaCgQ2w5HZSQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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