Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caef40b0cf3b8643f19aecf98f41daf6b3786fc3861e48e84cc7d144658f29b' 
  AND token = 'm3rjvGarYY3Qq3FPjMR9EUrElzwRFzLuB99yjuDhPFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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