Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a0cbeda7867f7662df5b248c0ae46b7294fd3f03de420ce2ee5438ab326a413b' 
  AND token = '9QpqMcL5gwR7aU8lgKLA25KjTfKUEZwZ5NoM8BGE06o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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