Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b3af3ccb0399ce5b42efc42a904e9f00c78ed2eded6401d221135da9cd6be5' 
  AND token = 'v1GeZXoeoovN/VrlKtFNBluwgFTEBCZqv9BK1Bu+QBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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