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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f421d098418d09f468a517cecb24bc2fe91ae5ad03b4076163d58d0688f49ef' 
  AND token = 'dpoCz4WRFiLvM9AyV4hosQaEV2cVX+Q6mhIms014odE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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