Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e6ee51590853c283c7601a38dc3ecb979adb7f1d035bfc4bc55857e8e3dc9' 
  AND token = 'M08P+XU3pch8AV4aAdRgw0As1ohhj7/E4TlHKHjSA1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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