Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64ef89359ba0d624f3a2f0fb87fd50fad1fd241e17b5ec2ff7ee2a2a55e586b' 
  AND token = 'WTAcjlKJCoWVlUPYBVkzgfItRSy363Aag0WUebrM23E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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