Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567e56543b5f26e7d74b79df2b7408c45ef4b1bf1afd9d5461d9ac68637b696b' 
  AND token = 'MIBGAwT1RaZW6xH1eaDQudYqX4ouWHbaEL4JbofS0zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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