Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c515afb05cdac43a668d59a7013df523c48fb9c7b6b66a0d078b173bc0b2436' 
  AND token = 'HnW2bMeBiSf5YvD5Mb49FAOg6k+3Z4mxA1VjVf5L/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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