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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23114c0af6191bf7f01093361e3d053b12ecb06ce2ad7a61f82f09d34f14fcf3' 
  AND token = 'EY8QIEyaTimmc0plPebPU+LlOGmhkUGtkUdeOKgb9fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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