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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fced5ff4537998c368d7aa55141a6494dd2e81f6075571a38c8f315b0ab1265' 
  AND token = '9gS6u9ov4hAr5ik3moNzF7iekcGO49/gFLzro8DGCHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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