SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a8dfcc0c40093030aeb8257589012b7d806a93f277fe10d20609690edcc76e45' 
  AND token = 'ffyvwYW3hPVW7HCZKLnvwfVJJX3rZbDM6i9TLWWdAjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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