Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5a62def781108a862575308baf5bcf33fe36f8d6e90b49d5d5d2716bef6f57' 
  AND token = 'tzew0KhvNn3gD+tp1O8XvPW3I2AgUQIrXykoGnq+Tqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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