Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc618f79eb026874698dc59bc17686751c4e5b4a683224078896d8c580274cb9' 
  AND token = 'AV9Rv/dsB6cQ9sIMBNb/+va/FlRI7NVClS0KYxCH+ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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