Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7c96b8752b2094e9667cc77f9ced3af5cec1556d2ab6a5a5ca9ae64b0c829c' 
  AND token = 'RCx4UUeuWaBkRUpTzThXucMz/RZkMFD9/nnZKhNLDKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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