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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '696d95a3f119ab68f24cd022c9f35d50e9eb817e635c882f3ff9c509909cc771' 
  AND token = 'cKlNySioPPVMbm6LxBORqgeVqjBy0+UtVwRVBxFVUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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