Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b71f8b7cb0e69e08cba227c68834112be9d7ed70f140b66a67c8551c18aa97c5' 
  AND token = 'z5ZWzZ1rqzga6TnQcgc/CjuqXE6pja1gHaiCfTl0ULc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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