Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87d1b71c761e92765ad1d7b49f06efff0ebe95e19b97d3288f0b0f2fe444a39' 
  AND token = 'PGkGMqFgY48Qf/RRA+sCAAMRMcLetTjX+cZNQA0bcbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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