Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6a63257dc43cd6883d4979d39b79b71bd739c46ed57a258032c70d136ea76c' 
  AND token = '2yviP4poX9T+w5P1u5YoBJUGLiN2ae5b69ygX+tcemA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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