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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11af033fd3bf0fbef3900a0985af2b3198886ec5a4cb184aad928dcce444b7fa' 
  AND token = '1NDOVH0WImVMrSUTXWyVi6S+Z6LWzfDUQU6C6+HNvVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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