Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f98364ba10b5aca038526bc856c41934408e327670a7274c32d2ee09c16a30' 
  AND token = '6+rFD5jaRl2veBJQU84VmBBMyGdy1C+seAnhQuHkbyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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