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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '323d4fd409748c31e2d39ac93f567d2555c3d5d65ee47115923b9c9e2b2b6d8f' 
  AND token = 'bhK2xW2fxXu3mJ4QSzufh8Sls36iVmybN+LQVNU+X+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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