SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd12ae619131e4fde99378550c8e02caeb1a213a2c72e19075ba4df8f3f251016' 
  AND token = 'glX0WBs8VRvQu+p4G0Yoz+tAPR2625cm6Xnph7kvrU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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