Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f420bd78ae80305c28dbc0cc8ca1836ef04ae68db7e306932acf5d15ee0a198' 
  AND token = 'HTiMetE1f5El81wZUQ/miST1WQOvgvpLyO7scR+oz7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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