SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dc00054d2e094cf93d5122fc0fb3cb36ad171448783b1043f88f5137b4845fdb' 
  AND token = 'BBLA4iDFPnfchBwA8V7toe6m3OJi/wCj+G+0o9jtORM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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