Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6878bd320fad88fc3fb53f1c3a577a2710faa3ba2de2f199269ddae77ff3588b' 
  AND token = '7uWJFhNdUXZj/W52hc5y5LOJSdP+gDG0e98dCzvJ+m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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