Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98d0c2e336b0b3b1031828c7bcb14f0f7fcf2ff8c7c56cd281935234e9c0908' 
  AND token = '8Ea0np2xtDEXqdhHu+pITk1wbiw82AHp6cd+xZQlNLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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