Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9e4ea3544da1e89af77a9e89c199abf5968aafc8c69603bc0403ff9aad8b78' 
  AND token = 'q7IIy9noz6YvmvbIqnAyXpl4Ln2xOUTS9wOvk1lJd3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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