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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e48904b9b75c3b1f75a3946fde3c4367ee45daf0f6500172c1b1469a36a30716' 
  AND token = 'RhLz3rPj4LXAKDslqjEs7NgMvJsezl2NtblMmy4e6AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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