Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98125b961e2155bb42ae03d66a35e7e0abaa0a16e5e70cee76a42c2e22d41f7' 
  AND token = 'JRKrf3N+LXAr4u/UJBEWDNRLvbvwLTWUXYmDd8IT8hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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