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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8da01f791e77a180acfd5518c78ccef09d22b0aa5df25de189a673c9d05fc39b' 
  AND token = '0YCQWq6Xycl1TrLllL1vmCs8bzyn5eHrpMuzA2pwH1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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