Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72846a4a465246492ccde7f2ec9b04deafc869154b363bcfaa98bb576bbea585' 
  AND token = 'EDaIflH4GM028RVqmXqf/IbGqxPo8KDg/CxL56RyGT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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