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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4272fba73c5f1e68797cf47d28dec5f7ad8b5f43745eb7cca766cd44ea0fd30d' 
  AND token = 'jvt9jpNTVBizaxzaV7PmOaYOZTvlp04JRI+kpG/ytLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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