Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687600d55fc9a4360b10bef473dc1a16966a078211bf40fa7be00860ea6ef96d' 
  AND token = '999zFfHD92YH54sHRxwe5vCF2IjdrpGTPtK6ZNCYRCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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