Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e54860c3bb46a0bbf83d373d609edbe7b40709da1a5e6f8bf8052f1b5914ef2' 
  AND token = '7gx3hcVhb60aHHnbJibNSnT/zdNQZ8TKhd4K9j+qkAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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