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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e8319702eadb40fcf1f181bc4d504ae887bb37229936f6c7b8c8a348b1e2250' 
  AND token = 'rFB9WxDWHzIwuHbe4HMIfq79fSenuNM6R8W+xei6DHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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