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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e0f02181fc7925841179101a45f1edd6335180a742cdeedab77b3497ef89eaf' 
  AND token = 'K0LacA/tniW9GQJIPppTRPTsye8AR5x8grOLne1s6EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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