Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08ad7312ae4389232dc6776aad0e7581b7fa89add7548bbab406da11048c574' 
  AND token = 'uY2aFMwTN4dLKYPkbjIMEKfcf4K8yFoTV02eizb7neo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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