SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e2ce7ee8c1ca8f1d73b6961f94b7463985446122f310177bb5cbc28435a5869' 
  AND token = 'BpXoi0dtpb/FSDXsVKqUxTz45O+NDRXENMwcC7GE9xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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