Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e88e7b7a9f313f8921e6257003981707aa2c072058ab922f4d7b343d852e390' 
  AND token = 'wZq6nyVWtYe1sIpThZTh23SEB7+3vWfTkS1wHI09ubg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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