Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a641a6520abc86a959ed062e735b51439d5331dcbdd0070ade3f4cf8d5875e9' 
  AND token = 'wWKuuLxlF7dd7CkijrtBiOA97Lz3rhRbzxIlieV/66A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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