Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c111999fac8c13d184e400f03663c439c931773b5354738178b28fdfdc75d1c' 
  AND token = 'lK1THvRg0sL1NOwv19BScqnKce+gFTXNweVF2Adt7AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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