Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df520331dbe12afd27d4fc94c7195b2d03b3c38159ff38b7d8aa0a0e3cc52d3b' 
  AND token = 'oiGr7ml6Gyk4BwT0eRd8Zyv9/fR8ytC8+fWv6NNt3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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