Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38800b7b66534cd6a91c66615e9543ef8a251a0e08a1c556d473c3df3b2ada1' 
  AND token = 'FX6Ib2r0ElArNVnzIrHkXUYLM9Hc9ysM02rj6p2l5fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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