Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68292a03bdb8ce2ef634be0b9dd3ba31b7df36ab0af829b9cdcc089c47ec9ae5' 
  AND token = 'UUfwh3vBm0N+rSQQL6yy+CuHRGSE64SNKat43jcVuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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