Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739775da9c2beca7cfcd96a4c09b28904d62e16d0d4c7d0ec303f8ebc4cba771' 
  AND token = 'nc5pRstfaL9NUmVasCQe/Z9lIIyfmDoVoztPZPb+u7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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