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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54de4fa9393542508919ebef6bc4776ef2549d60343b9a3f758433a1ab54fe9c' 
  AND token = 'z9D4KIaykAlwMHYXSN+okfZf++1vGXkk+Az0cxN9UDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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