Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e77c81b7911d377e6b2f4ca48863e0f39217c0e7e114cd60caf9f3f06b7e1ec' 
  AND token = 'QhIqYgFF+9FS8fB/Q8zkkYvcUb3bJR3Rx9oOPyg89PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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