Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967b8027fc807f21e8fddd1db5f7d6aa5c78939325b20a274dbf5aad6dca54cc' 
  AND token = 'H9ifGsAOb6/mjqesGxd1IokqtyF+/8IY/7ZbTDqbg8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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