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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54015e5a2235d02a20054a4ec4a78d6fc915ef7a7545aae01c4ac0a384e853ea' 
  AND token = 'OdOICRU+N6IgdfntRUh62bQ1HxB3ICQvYU3w8pICjZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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