Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a8f46b161bb33c22ca3bd3c4d2abf3a0722252988e6cba38950c5e54e6fdc' 
  AND token = '87d8YFm7xEixTEOQV+JDpmxb8alMbj3pCykseKGd2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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