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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39eb3588f7b8b6ec4bac7849d860bab188324e49f9c1d5fd4af8d612f9839287' 
  AND token = 'b3C2Zo4HgvcACIL019pfSHSPtIjRZIlbYtfVn0XF1jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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