Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08209c58d4396feeb085d462f49595a100b8c88e9af54b1fd8f2cff83d89942c' 
  AND token = 'c0sBz0uKCdpCOGESRxj+qzjhjFDkviRxcCzt3hG5LiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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