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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9728d613628fc5670858f62e815cc7f4ba5831208b54344d465f2cac3aa3ef95' 
  AND token = '4p0n6rxaE95xYcUKgFIE/cVPCx+n5//AuM4zNCwTNXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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