Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827170a580368047aba59b91ef3500d8606da1f23a02f1c717b71e414314aeb2' 
  AND token = 'cIxDuohkCXplKf3kue0ACx7SGZ41IBElm9VwuB5Nv6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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