Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d4a71cd6943a153d4d31525eb5b87f3462f10f4fbff6ee4e44112a5e0b218b' 
  AND token = 'AFgNhjrAFcLxFx8kPWTlvLnryLDXOfBSzNLpwrPZjxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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