Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b90228a5c38ad1bfb5dd7a70a2333f7726f6ec947e5277a0b35ca1b5f743c2a' 
  AND token = '+Bq0wIM4R+SIeMGmeDF7Ul5fOsksZlNupLYdZwFKvj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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