SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f34a26964390c333be8260935a2c7aa47c10d103a278f3a1304151cf65082e71' 
  AND token = 'pTfJ1+/3AAYXmjH27Ug4QtSW4loSmlzWUw+xXlhYnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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