Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf748765d822d7febee0ff6a23417ffd6068fe86d4b10e886339f0d3a3ac09a' 
  AND token = 'iwj+EYWv2QrvXDM2K9XNTxIL2j5zgV5WDQVFj2XkGW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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