Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeac75e96eaa2cfd258f36820dd3d3170714fe9e29e457e49546620da9d40c3' 
  AND token = 'rd5N9UQTtMe02zyDvbyKgv6vfM/DfMTsnJTdluUDq5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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