Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77102be500eac5122b5264fe879baae83adac2351b4182961018014f65d1fea' 
  AND token = 'reKq/NBW7NK50xcrEIsK9j9bTPfrqfmUF5Yw+j7OHBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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